Measuring flat space
Area is the amount of flat surface a shape covers, measured in square units. It matters for flooring, painting, plots of land, fabric and any job where you buy material by the square foot or metre.
This calculator handles 12 shapes: square, rectangle, triangle, circle, semicircle, sector, ellipse, trapezoid, parallelogram, rhombus, regular polygon and ring. Results are converted to square metres, square feet, square yards (gaj), acres and hectares, which is handy for Indian land and property measures.
How it is calculated
Rectangle: A = length × width
Triangle: A = ½ × base × height
Circle: A = π r²
Trapezoid: A = ½ (a + b) × h
Worked example
Rectangle 8 × 5 and a circle of radius 7
- Rectangle area
- 40 sq units
- Rectangle perimeter
- 26
- Circle area
- 153.94
- Circle circumference
- 43.98
Common land and home area conversions
| Unit | In square feet |
|---|---|
| 1 square metre | 10.764 |
| 1 square yard (gaj) | 9 |
| 1 acre | 43,560 |
| 1 hectare | 107,639 |